Calculating machine



May 9, 1939.

WIT/V555 G. W. HOPKINS, JR

CALCULATING MACHINE Filed May 8, 1931 FlE `L 19 Sheets-Sheet l ATTORNEY G. w. HOPK|NS.'JR

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May 9, 1939.

Filed May 8, 1931 G. W. HOPKINS, JR

CALCULATING MACHINE 19 Sheets-Sheet 19 WITNESS MEZ/w' Patented May 9, 1939 UNITED STATES PATENT OFFICE CALCULATING MACHINE Application May 8, 1931, Serial N0. 535,881

19 Claims.

The present invention relates to combined adding and calculating machines, and particularly to the type in which the values entered into an item register are utilized to control digitation on one or more registers provided for accumulating and totalizing operations.- This machine is adapted to perform addition, subtraction, multiplication, and division in an entirely automatic I manner upon manipulation of the proper controls. Such a machine is disclosed in my abandoned application for Letters Patent of the United States, No. 271,677, ,filed April 4, 1928, of which this application is a continuation in part.

It is an object of the invention to provide a combined adding and calculating machine whereby the adding machine may be used singly or in conjunction with a calculating attachment as a complete calculating machine.

Another object of the invention is to provide a combined adding and calculating machine in mechanism.

Another object of the invention is to provide a shiftable item register in a key operated adding machine.

Another object of the invention is to provide improved resetting mechanism for a shiftable item registering mechanism in a key operated adding machine.

Another object of the invention is to provide a power drive for a key operated adding machine whichis initiated by depression of any control key or by any value key of said adding machine.

Another object of the invention is to provide an accumulating mechanism which may be'actuated either forwardly or reversely from the actuating mechanism, and which may be split to vregister separate items on various sections thereof, the sections being selectively operable to receive either positive or negative increments of movement.

Another object of the invention is to provide an improved transfer mechanism whereby a 5 transfer may occur simultaneously within groups of the orders with both an independent actuator and an entrained mechanism whereby a large number of orders may be provided in the register.

Another object of the invention is to provide a plurality of markers for'separating the numbers entered in a register into groups, said plurality of markers being simultaneously operated by a manual control.

Another object of the invention is to provide a totalizing register which is adaptedto receive items either fromv the actuator or from the accumulating mechanism in either a positive or a negative sense.

Another object of the invention is to provide means whereby items may be transferred in either a positive or in a negative direction from a totalizing register to an accumulating register, o vice versa.

Another object of the invention is to provide two revolutions counters which may be actuated selectively in a reverse direction with respect to each other and to the actuating mechanism.

Another object of the invention is to provide a manual control for determining whether one or a plurality of registers will be zeroized upon operation of a singleresetting control member.

Another object of the invention is to provide' a general operation controlling means whereby single orplural positive or negative actuations of either the accumulator or the grand total register may be determined selectively.

Another object of the invention is to provide selective sensing means whereby any of a plurality of registering mechanisms may be sensed to utilize the values standing thereon in controling machine operation.

Another object of the invention is to provide manual control for selectively enabling the sensing means for any one of a plurality of registering mechanisms.

Another object of the invention is to provide manually operable means for disabling the sensing mechanism for one or more registering mechanisms.

Another object of the invention is to provide automatic control mechanism for determining and enforcing a correct sequence of functional cycles in the solution of problems in division and multiplication.

Another object of the invention is to provide automatic control mechanism which may be selectively used to control anyone of a plurality of automatic operations.

Another object of the invention is to provide automatic division mechanism whereby the oper- 

